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08066 Determining Compatibility of High Strength Steels to Cathodic Protection

Picture for 08066 Determining Compatibility of High Strength Steels to Cathodic Protection
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Product Number: 51300-08066-SG
ISBN: 08066 2008 CP
Author: Mike Billingham and Gareth John
Publication Date: 2008
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National and International standards and codes-of-practice for cathodic protection provide general guidance for negative polarized potential limits to prevent damage (which can occur due to excessive hydrogen formation) where specific performance data is not available. With the application of cathodic protection to high strength steels and alloys there is an increasing need to determine the acceptable negative limit for a particular alloy / environment combination, which can only be determined by laboratory testing. This paper summarizes the issues associated with determining the negative potential limit, describe the different laboratory test methods (constant strain, constant load, slow strain rate, stepped load, stepped potential etc), and the issues associated with determining the specific acceptance criteria. Examples of test data from a number of different steels and alloys and exposure environments will be presented to illustrate the problems faced in designing, carrying out and interpreting these tests.
National and International standards and codes-of-practice for cathodic protection provide general guidance for negative polarized potential limits to prevent damage (which can occur due to excessive hydrogen formation) where specific performance data is not available. With the application of cathodic protection to high strength steels and alloys there is an increasing need to determine the acceptable negative limit for a particular alloy / environment combination, which can only be determined by laboratory testing. This paper summarizes the issues associated with determining the negative potential limit, describe the different laboratory test methods (constant strain, constant load, slow strain rate, stepped load, stepped potential etc), and the issues associated with determining the specific acceptance criteria. Examples of test data from a number of different steels and alloys and exposure environments will be presented to illustrate the problems faced in designing, carrying out and interpreting these tests.
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